CN111473611A

CN111473611A - Intelligent circulating hot air drying box for controlling moisture of cement test block

Info

Publication number: CN111473611A
Application number: CN201911362947.6A
Authority: CN
Inventors: 曹瑞东; 刘扩; 杜瑞鹏; 贾楠; 马玉静
Original assignee: Shanxi University
Current assignee: Shanxi University
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-07-31
Anticipated expiration: 2039-12-26
Also published as: CN111473611B

Abstract

The invention discloses an intelligent circulating hot air drying box for controlling the moisture of cement test blocks, which comprises a machine case, a drying chamber and a test block storage chamber, wherein the drying chamber and the test block storage chamber are arranged in the machine case, a heat insulation layer is arranged between the drying chamber and the test block storage chamber, a cavity is arranged in the middle of the drying chamber, a plurality of spiral lifting mechanisms are arranged in the cavity, a support frame is arranged at the top of each spiral lifting mechanism, a plurality of through holes are formed in the heat insulation layer corresponding to the spiral lifting mechanisms, an electric door for sealing the through holes is arranged in the heat insulation layer, a pushing device is arranged above the heat insulation layer in the test block storage chamber, air inlets of the drying chamber are arranged on two sides in the drying chamber, hot air conveying devices are respectively arranged at the air inlets of the drying chamber corresponding to the two sides in the. The invention can accurately and intelligently control the moisture of the target object and make up for the defect of the conventional drying box for general drying.

Description

Intelligent circulating hot air drying box for controlling moisture of cement test block

Technical Field

The invention relates to the technical field of laboratory drying equipment, in particular to an intelligent circulating hot air drying box for controlling moisture of a cement test block.

Background

In the building material industry, people have not only simply and generally dried objects but also have precise and specific requirements on drying of the objects, and also put forward a new requirement on mastering of the material drying progress, namely, a higher requirement on moisture controllability of the dried objects. Especially in some cement material research and development experiments, different cement test blocks require different water contents, and the water reduction amount of different test blocks per hour in the drying process also has different requirements. Most drying boxes in laboratories and markets can only carry out unified operation and drying on the same level on test blocks, are not wide in applicability and intelligent enough, and appear to be somewhat elusive in various cement research experiments. Because the water content of the cement test block is an important experimental reference data, it is important to quickly and accurately obtain the relevant data of the cement test blocks with different water contents and achieve the drying target, but in the test block drying process, an experimenter often has to waste a lot of time and energy to uninterruptedly check whether the test block is dried. In addition, in the face of most current drying boxes, the temperature in the drying box can be reduced by frequently taking and placing test blocks and opening and closing the box door by experimenters, so that the heat in the drying box is lost, the energy consumption of the drying box is increased, the drying efficiency is reduced, and the experiment progress is delayed. At present, the existing drying boxes in the laboratory and the market have the same defects: firstly, the accurate control of the moisture can not be carried out to the cement test block with different water content requirements. Secondly, a large amount of heat is taken away at the same time when the humid air is discharged, so that the relative power consumption of the heating assembly in the drying process is large, the working efficiency is low, and the test progress is delayed. And thirdly, in the drying process, laboratory personnel are required to continuously take and place the test block to check the drying condition of the test block, so that the operation is complex and the drying process is not intelligent enough.

Disclosure of Invention

For solving the shortcoming and the deficiency of prior art, provide an intelligence circulation hot-blast stoving case of control cement test block moisture to the moisture of accurate, intelligent control target object has compensatied the defect that stoving case was dried in the past in general.

The intelligent circulating hot air drying box for controlling the moisture of the cement test block comprises a machine case, a drying chamber and a test block storage chamber, wherein the drying chamber and the test block storage chamber are arranged in the machine case, a heat insulation layer is arranged between the drying chamber and the test block storage chamber, a cavity is arranged in the middle of the drying chamber, a plurality of spiral lifting mechanisms are arranged in the cavity, a support frame is arranged at the top of each spiral lifting mechanism, the heat insulation layer is provided with a plurality of through holes corresponding to the spiral lifting mechanisms, an electric door used for sealing the through holes is arranged in the heat insulation layer, a pushing device is arranged above the heat insulation layer in the test block storage chamber and used for pushing the test block upwards conveyed by the spiral lifting mechanisms, a storage chamber door is arranged at the top of the test block storage chamber, drying chamber air inlets are arranged at two sides in the drying chamber, and hot air conveying devices are respectively arranged at the drying chamber air inlets corresponding to two, the hot air conveying device on the two sides is communicated with the circulating air pipe, a vent communicated with the circulating air pipe is arranged at the top of the drying chamber, a first cabin door is arranged at the front end of the drying chamber, the spiral lifting mechanism is abutted to the pressure sensor, the pressure sensor is electrically connected with the single chip microcomputer, a temperature controller is arranged in the drying chamber and electrically connected with the single chip microcomputer, and the single chip microcomputer is used for controlling the actions of the hot air conveying device, the spiral lifting mechanism and the electric door.

As a further improvement of the above scheme, the spiral lifting mechanism includes a lower sleeve, an upper sleeve, and a spiral lifting rod, the upper sleeve abuts against the lower sleeve, the lower sleeve abuts against the pressure sensor, the spiral lifting rod is disposed in the lower sleeve, the upper sleeve is sleeved on the top of the spiral lifting rod, and a gap is left between the top of the spiral lifting rod and the upper sleeve.

As a further improvement of the scheme, the top of the spiral lifting rod is provided with a roller, and the roller is in contact with the upper sleeve.

As a further improvement of the scheme, the pushing device comprises a small motor and a screw rod arranged at the output end of the small motor, and the other end of the screw rod is connected with a pushing plate.

As a further improvement of the above scheme, the pushing device further comprises a spring tongue switch arranged below the small motor, the spring tongue switch is connected with the connecting pipe, a sliding rod is movably arranged in the connecting pipe, the other end of the sliding rod is connected with a boosting block, the boosting block is arranged corresponding to the through hole, and the boosting block is arranged in a shape with a wide top and a narrow bottom.

As a further improvement of the scheme, the hot air conveying device comprises a circulating fan and a U-shaped heating pipe network, wherein the circulating fan is arranged in a circulating air pipe.

As a further improvement of the scheme, a horn-shaped first shunt pipe is arranged between the air outlet of the circulating fan and the U-shaped heating pipe network, and a plurality of air channels are arranged in the first shunt pipe.

As a further improvement of the scheme, a second shunt pipe is arranged between the U-shaped heating pipe network and the air inlet of the drying chamber, and the second shunt pipe is provided with a plurality of air channels.

As a further improvement of the above scheme, the U-shaped heating pipe network is composed of a plurality of U-shaped stabilizing heating pipes.

As a further improvement of the scheme, a filter screen pipeline is arranged in the middle of the upper end of the circulating air pipe, a plurality of clamping grooves are vertically formed in the filter screen pipeline, a plurality of silica gel nets are inserted into the clamping grooves, and a second cabin door is arranged at the top of the case corresponding to the filter screen pipeline.

The invention has the beneficial effects that:

compared with the prior art, the intelligent circulating hot air drying box for controlling the moisture of the cement test block, provided by the invention, has the advantages that when the intelligent circulating hot air drying box is used, a target object is placed on the rack at the top end of the spiral lifting mechanism, hot air conveying devices on two sides are opened to form hot air convection, the target object is dried, then hot air with moisture is guided into the circulating air pipes on the left side and the right side, the circulation utilization of the hot air is realized, the heating mode of hot air exhaust of the conventional drying box is abandoned, the test block is dried in a hot air circulating drying mode, the working efficiency is higher, the energy is more saved, air after being dried and heated enters the circulating pipeline again under the action of the circulating fan to be heated, the internal temperature of the machine box can reach the preset target temperature within a short time, in the drying process, the moisture of the test block is continuously emitted, and the weight of the test block, when reaching the setting value, go up and down through single chip microcomputer control spiral elevating system, open the electrically operated gate of closed through-hole, the test block is carried to the insulating layer top, promote the test block by pusher again, afterwards, through opening the apotheca chamber door, just can take out the test block, the temperature controller and the single chip microcomputer electric connection of setting judge the ambient temperature that the test block is located, the perception temperature height, thereby signals, pass to the singlechip with the signal and carry out data processing, the operation of output command control heating through the procedure operation, thereby the temperature in the control box.

Drawings

The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:

fig. 1 is a schematic view of an external structure of a drying box of the present invention;

FIG. 2 is a schematic view of a control panel of the drying box of the present invention;

FIG. 3 is a schematic view of the internal structure of the drying box of the present invention;

FIG. 4 is an exploded view of the hot air delivery apparatus of the present invention;

FIG. 5 is a top plan view of the drying box of the present invention;

FIG. 6 is a schematic view of an inner structure of a drying chamber according to the present invention;

FIG. 7 is a schematic view of the spiral elevating mechanism of the present invention;

FIG. 8 is a schematic view of a portion of the thermal barrier layer of the present invention;

FIG. 9 is a diagram of the process of pushing the test block by the screw elevating mechanism of the present invention;

FIG. 10 is an enlarged view of the top feeding test block of the screw elevating mechanism of the present invention;

FIG. 11 is a block diagram of a quality control routine of the present invention;

FIG. 12 is a block diagram of a temperature detection control routine of the present invention;

FIG. 13 is a schematic diagram of an electronic circuit master MCU of the present invention;

FIG. 14 is a circuit diagram of a hardware reset of the present invention;

FIG. 15 is a circuit diagram of an L ED display screen according to the present invention;

FIG. 16 is a circuit diagram of a temperature sensor of the present invention;

FIG. 17 is a circuit diagram of a control panel according to the present invention;

FIG. 18 is a block diagram of the L ED display screen of the present invention;

FIG. 19 is a circuit diagram of a temperature sensor module of the present invention;

FIG. 20 is a circuit diagram of a control panel key module according to the present invention;

fig. 21 (i) to (n) are circuit diagrams of six-way pressure sensors according to the present invention.

Detailed Description

As shown in FIGS. 1-21, the intelligent circulating hot air drying oven for controlling the moisture content of cement test blocks provided by the present invention comprises an oven case 100, a drying chamber and a test block storage chamber arranged in the oven case 100, wherein a thermal insulation layer 3 is arranged between the drying chamber and the test block storage chamber, a cavity is arranged in the middle of the drying chamber, a plurality of spiral lifting mechanisms 200 are arranged in the cavity, a rack 41 is arranged on the top of each spiral lifting mechanism 200, a plurality of through holes are arranged on the thermal insulation layer 3 corresponding to the spiral lifting mechanisms 200, an electric door for closing the through holes is arranged in the thermal insulation layer 3, a pushing device is arranged above the thermal insulation layer 3 in the test block storage chamber for pushing the test blocks 300 conveyed upwards by the spiral lifting mechanisms 200, a storage chamber door 5 is arranged on the top of the test block storage chamber, drying chamber air inlets 6 are arranged on two sides in the drying chamber, hot air inlets 6 in the oven case 100 corresponding to two sides, the hot air conveying devices on the two sides are communicated through a circulating air pipe 7, the top of the drying chamber is provided with a vent communicated with the circulating air pipe 7, the front end of the drying chamber is provided with a first cabin door 9, the spiral lifting mechanism 200 is abutted to a pressure sensor, the pressure sensor is electrically connected with a single chip microcomputer, a temperature control instrument is arranged in the drying chamber and is electrically connected with the single chip microcomputer, and the single chip microcomputer is used for controlling the actions of the hot air conveying devices, the spiral lifting mechanism 200 and the electric door. Wherein, temperature control appearance includes temperature probe and temperature sensor, and temperature probe stretches out from the bottom circuit, and the probe height is close with test block 300 height, and the accurate ambient temperature that reflects test block 300 and locate, temperature sensor perception temperature height to the signal is given, gives the singlechip with the signal and carries out data processing, sets up the initial value of temperature control regulating program with the data that obtain, and the operation of program operation output instruction control heating pipe network, thereby the temperature in the control box.

In a further improvement, the spiral lifting mechanism 200 comprises a lower sleeve 10, an upper sleeve 11 and a spiral lifting rod 12, the bracket 41 is composed of a plurality of steel pipes, the steel pipes are parallel to each other to form a square rigid frame, the bracket 41 is supported by four obliquely upward supports, the lower ends of the four supports are welded on the upper sleeve 11, the spiral lifting rod 12 is driven by a small electric spiral lifter, the small electric spiral lifter is arranged at the bottommost layer of the case 100 and is positioned below a quality monitoring and control system circuit, the upper sleeve 11 is abutted against the lower sleeve 10, the lower sleeve 10 is abutted against a pressure sensor, the spiral lifting rod 12 is arranged in the lower sleeve 10, the upper sleeve 11 is sleeved at the top of the spiral lifting rod 12, and a gap is reserved between the top of the spiral lifting rod 12 and the upper sleeve 11. When the drying is started, the upper sleeve 11 is pressed on the lower sleeve 10, the spiral lifting rod 12 is not stressed, the lower sleeve 10 extends to a base of a bottom layer of a machine, the pressure sensor is arranged below the base, in the drying process, moisture of the test block 300 continuously dissipates, the weight of the test block 300 is transmitted to the pressure sensor through the upper sleeve 11 and the lower sleeve 10, the pressure sensor can directly transmit obtained digital signals to the single chip for data processing, a plurality of programs are programmed in the single chip, data analyzed by the single chip can be set as an initial value operation program in a default mode, a program M is arranged in a quality monitoring and control circuit of the single chip, the program M controls a series of work operations of a small electric spiral lifter, an electric door and the like, after the drying is finished, the single chip controls the spiral lifting rod 12 to continuously rise, and pushes the test block 300 to a storage chamber, the test block 300 is placed in the designated position of the storage room in cooperation with the pushing device.

In a further improvement, the top of the spiral lifting rod 12 is provided with a roller 13, and the roller 13 is contacted with the upper sleeve 11. The rollers 13 on the two sides are steel rollers 13 with smooth surfaces,

as a further improvement of the scheme, the pushing device comprises a small motor 431 and a screw rod 432 arranged at the output end of the small motor 431, and the other end of the screw rod 432 is connected with a pushing plate 433. The pushing device further comprises a spring tongue switch arranged below the small motor 431, the spring tongue switch is connected with the connecting pipe, a sliding rod is movably arranged in the connecting pipe, the other end of the sliding rod is connected with a boosting block, the boosting block corresponds to the through hole and is in a shape which is wide at the top and narrow at the bottom. When the bracket 41 passes through the electric door, the bracket 41 extrudes the boosting block, when the bracket 41 and the push plate 433 are positioned on the same horizontal line, the deformation of the spring tongue reaches the maximum, at this time, the boosting block can act on the spring tongue switch through the sliding rod, and the small motor 431 is started to work.

As a further improvement of the above scheme, the hot air delivery device comprises a circulating fan 51 and a U-shaped heating pipe network 52 which are arranged in the circulating air pipe 7.

In a further improvement, a trumpet-shaped first shunt pipe 53 is arranged between the air outlet of the circulating fan 51 and the U-shaped heating pipe network 52, and a plurality of air ducts are arranged in the first shunt pipe 53. The wind flow is diffused through the trumpet-shaped first shunt pipe 53; the U-shaped heating pipe network 52 is composed of a plurality of U-shaped stable heating pipes, so that the wind passing through the U-shaped heating pipe network 52 can be uniformly heated; a second shunt pipe 54 is arranged between the U-shaped heating pipe network 52 and the drying chamber air inlet 6, and the second shunt pipe 54 is provided with a plurality of air channels for shunting the heated air again; the hot-blast conveyor that the symmetry set up makes left and right sides symmetry parallel wind meet, it is hot-blast to form the forced convection in the drying chamber, hot-blast mutual washout makes test block 300 can fully receive the hot-blast effect, the hot-blast circulation tuber pipe 7 that will have the hot-blast of moisture of air-passing through the vent at drying chamber top of high-speed flowing takes the drying chamber top left and right sides, circulation duct internally mounted one row of silica gel net 61 can be dry through silica gel net 61 air, in the drying process, each chamber door all is in encapsulated situation, the continuous circulation of incasement air, the moisture of test block 300 is constantly taken away to the hot-blast of high-speed flowing, test block 300 must constantly be dry.

As a further improvement of the above scheme, a filter screen pipeline is arranged in the middle of the upper end of the circulating air pipe 7, a plurality of clamping grooves are vertically arranged in the filter screen pipeline, a plurality of silicon rubber nets 61 are inserted in the clamping grooves, and the top of the case 100 is provided with a second cabin door 14 corresponding to the filter screen pipeline. After the test block 300 is dried, the silica gel net 61 can be dried by opening the second door 14, and the silica gel net 61 is a drying net which can be recycled, so that the test block is more environment-friendly and energy-saving.

The external part of the circulating air pipe 7 is made of stainless steel material coated with anti-drop paint, so that the circulating air pipe is rust-proof and corrosion-resistant, and the service life of the pipeline is prolonged.

The first door 9 is set as a push type handle, a barb corresponding to the push type handle is arranged on a door frame on the right side of the case 100, a temperature and moisture quality reduction speed control panel is arranged on the left side of the front side of the case 100, a temperature control panel with accurate temperature control and simple operation is adopted for temperature control, the drying temperature and the moisture reduction speed of the dried material are set through keys, the temperature control panel comprises an L ED display screen, wherein a L ED display screen displays data, namely, the real-time temperature, the preset temperature (room temperature-300 ℃), the reduction speed of each dried material amount, the current quality and the initial quality in a drying chamber, a main power switch and a circulating fan 51 knob switch are arranged below the operation panel, and the power-on of the drying chamber and the work of the circulating fan 51 are respectively controlled.

According to the invention, the left side surface and the right side surface of the case 100 are provided with the detachable heat dissipation plates, so that later maintenance and cleaning of internal parts of the machine are facilitated, the detachable heat dissipation plates are provided with a plurality of strip-shaped heat dissipation ports, and the heat dissipation ports are made into a dustproof baffle type, so that the influence of external dust on the internal parts of the machine is reduced. The exterior material of the case 100 is a stainless steel plate, the surface of the case is covered by the anti-corrosion and anti-drop paint, the inner container of the case 100 is made of the stainless steel plate, the periphery of the drying chamber, the door of each case, the heat insulation layer 3 of the storage chamber and the heat insulation layer are all made of superfine glass wool meeting GMP standards, and the bottom of the case 100 is supported by four adjustable bottom columns, so that the case 100 can work in a stable position.

The working principle of the control part of the invention is as follows:

the lower sleeve 10 is connected with pressure sensors (i-N) positioned in the shell, wherein ch1 is an analog input port 1, the pressure sensors share a control port through cs1 and clk7, data are led out by matching 6 data ports of an AT89C52 singlechip, and programs M (shown in figure 5) and N (shown in figure 6) are set by the singlechip. When the pressure sensor detects the pressure, the deformation force is converted into an electric signal to be amplified and processed, and the electric signal is transmitted to a CPU in the single chip microcomputer to be processed. Starting a program M, importing initial mass data of the test block 300 into the program M, wherein the default data is the initial data M0, controlling the time by a singlechip clock sck, calculating the mass difference of the latest hour of the mass by the program operation at one hour interval, weighing the mass of the test block 300 by a pressure sensor (a mass detection system) to obtain data M1, and if the inequality is satisfied at the moment (M0-M1)<M3 (here, M3 is an artificial set value), the one-chip microcomputer control circuit (b) enables the small electric screw elevator to start and open the electric door. The spiral lifting rod 12 pushes the bracket 41 to rise, and the test block 300 continuously rises to the electric door. Along with the continuous rising of bracket 41, when bracket 41 reaches electronic door position, bracket 41 extrudees No. 2 travel switch in right side, and spiral elevating system 200 stops to rise, and time delay relay KT₁The power-on time delay is 20s closed, the electric door is 25s closed (the electric door circuit is similar to a spiral lifting mechanism circuit), the spiral lifting rod 12 returns until the No. 3 travel switch is touched and stops, and the electric door is closed. The left side of the bracket 41 continuously moves through the boosting block and the sliding rod until the extrusion spring tongue presses a switch SB5 of the pushing device,

contactor KM in control loop through M2₃、KM₄The small motor 431 is controlled to rotate by the rotation shaft to further push the screw rod 432 and the push plate 433 connected with the screw rod to advance by the interlocking self-locking principle of the circuit, when the No. 1 travel switch is touched, the pushing device contracts to move, the test block 300 is pushed to a specified position, and the door of the storage chamber is openedAnd 5, taking out the dried test block 300. In the process that the lifting and returning program M of the bracket 41 delays for 20 seconds, the pushing device finishes one cycle of telescopic motion, the electric door automatically closes after 25 seconds, and the machine gives out a prompt sound. If the program M does not satisfy the inequality (M) in operation₀-M₁)<M₃Then, order M₁＝M₀The program continues to cycle, and the drying chamber continuously dries the test block 300. When the program M is started, the temperature sensor circuit transmits the measured current temperature data to the single chip microcomputer through the SO interface SO as to be led into the pressure sensor circuit, the program outputs a command of stopping heating or continuing heating, and the operation of the U-shaped heating pipe network 52 is controlled through the program control circuit and the circuit, SO that the temperature of the drying chamber is controlled.

The upper key and the lower key of the control panel circuit are set as the sv number of the target temperature of the drying box, the digit number is switched by the left key and the right key, and the data setting is confirmed by the ok key. The drying rate of the test block 300 is controlled by setting the hourly moisture reduction quality, and at the same time, the system continuously detects and displays the initial quality and real-time quality of each test block 300. The MODE switch and the drying box power switch are respectively arranged below the control panel, the MODE key switches the MODE, the current value is displayed once, the setting is entered for the second time, the preset value is input, the operation is started for the third time, the first setting interface is returned, and the real-time temperature pv and the real-time quality of the drying box are displayed. The display screen circuit is matched with the AT89C52 singlechip to carry out parallel data transmission to realize the display function. In addition, the REST part of hardware in the hardware reset circuit is reset by matching with software, so that the fault tolerance rate of work is improved.

The above embodiments are not limited to the technical solutions of the embodiments themselves, and the embodiments may be combined with each other into a new embodiment. The above embodiments are only for illustrating the technical solutions of the present invention and are not limited thereto, and any modification or equivalent replacement without departing from the spirit and scope of the present invention should be covered within the technical solutions of the present invention.

Claims

1. The utility model provides a control cement test block moisture's intelligent circulation hot air drying case which characterized in that: the device comprises a case, a drying chamber and a test block storage chamber, wherein the drying chamber and the test block storage chamber are arranged in the case, a heat insulation layer is arranged between the drying chamber and the test block storage chamber, a cavity is arranged in the middle of the drying chamber, a plurality of spiral lifting mechanisms are arranged in the cavity, a rack is arranged at the top of each spiral lifting mechanism, a plurality of through holes are formed in the heat insulation layer corresponding to the spiral lifting mechanisms, an electric door used for sealing the through holes is arranged in the heat insulation layer, a pushing device is arranged above the heat insulation layer in the test block storage chamber and used for pushing test blocks upwards conveyed by the spiral lifting mechanisms, a storage chamber door is arranged at the top of the test block storage chamber, drying chamber air inlets are formed in two sides in the drying chamber, hot air conveying devices are respectively arranged at the drying chamber air inlets corresponding to two sides in the case, and the hot, the drying chamber top be provided with the vent of circulated air pipe intercommunication, the drying chamber front end is provided with first hatch door, spiral elevating system and pressure sensor butt, pressure sensor and singlechip electric connection, be provided with the temperature controller in the drying chamber, temperature controller and singlechip electric connection, the singlechip is used for controlling the action of hot-blast conveyor, spiral elevating system and electrically operated gate.

2. The intelligent circulating hot air drying box for controlling the moisture of the cement test block as claimed in claim 1, which is characterized in that: the spiral lifting mechanism comprises a lower sleeve, an upper sleeve and a spiral lifting rod, the upper sleeve is abutted to the lower sleeve, the lower sleeve is abutted to the pressure sensor, the spiral lifting rod is arranged in the lower sleeve, the upper sleeve is sleeved at the top of the spiral lifting rod, and a gap is reserved between the top of the spiral lifting rod and the upper sleeve.

3. The intelligent circulating hot air drying box for controlling the moisture of the cement test block as claimed in claim 2, characterized in that: and the top of the spiral lifting rod is provided with a roller which is in contact with the upper sleeve.

4. The intelligent circulating hot air drying box for controlling the moisture of the cement test block as claimed in claim 1, which is characterized in that: the pushing device comprises a small motor and a screw rod arranged at the output end of the small motor, and the other end of the screw rod is connected with a push plate.

5. The intelligent circulating hot air drying box for controlling the moisture of the cement test block as claimed in claim 4, wherein: the pushing device further comprises a spring tongue switch arranged below the small motor, the spring tongue switch is connected with the connecting pipe, a sliding rod is movably arranged in the connecting pipe, the other end of the sliding rod is connected with a boosting block, the boosting block corresponds to the through hole, and the boosting block is arranged to be in a shape which is wide at the top and narrow at the bottom.

6. The intelligent circulating hot air drying box for controlling the moisture of the cement test block as claimed in claim 1, which is characterized in that: the hot air conveying device comprises a circulating fan and a U-shaped heating pipe network, wherein the circulating fan and the U-shaped heating pipe network are arranged in a circulating air pipe.

7. The intelligent circulating hot air drying box for controlling the moisture of the cement test block as claimed in claim 6, wherein: a horn-shaped first shunt pipe is arranged between an air outlet of the circulating fan and the U-shaped heating pipe network, and a plurality of air channels are arranged in the first shunt pipe.

8. The intelligent circulating hot air drying box for controlling the moisture of the cement test block as claimed in claim 6 or 7, wherein: and a second shunt pipe is arranged between the U-shaped heating pipe network and the air inlet of the drying chamber, and the second shunt pipe is provided with a plurality of air channels.

9. The intelligent circulating hot air drying box for controlling the moisture of the cement test block as claimed in claim 6, wherein: the U-shaped heating pipe network is composed of a plurality of U-shaped stable heating pipes.

10. The intelligent circulating hot air drying box for controlling the moisture of the cement test block as claimed in claim 1, which is characterized in that: the circulating air pipe is characterized in that a filter screen pipeline is arranged in the middle of the upper end of the circulating air pipe, a plurality of clamping grooves are vertically formed in the filter screen pipeline, a plurality of silica gel nets are inserted into the clamping grooves, and a second cabin door is arranged on the top of the case corresponding to the filter screen pipeline.